The WP-PageNavi plugin adds a more advanced paging navigation interface below posts.
Log in to WordPress and follow the steps below.
- Go to Plugins → Add New
- In the Search Plugins field on the right hand side of the page enter wp-pagenavi and press the Enter key
- Click Install Now in the box for WP-PageNavi
- Once the plugin has installed, click Activate Plugin
If you are having trouble with the plugin installation process, see the link below.